【简答题】比较 四氯汞钾溶液吸收-盐酸副玫瑰苯胺分光光度法 与 甲醛缓冲溶液吸收-盐酸副玫瑰苯胺分光光度法 测定SO2的异同点?
【单选题】听力原文:I just had a visit to the new art museum. Isn't that outstanding? I think people should go there to appreciate those marvelous artworks. (28)
A.
Isn't he standing outside the museum?
B.
The art museum isn't new.
C.
Is the museum still standing?
D.
The new museum is excellent.
【单选题】用四氯汞钾吸收液—盐酸副玫瑰苯胺法测定环境空气中SO 2 时,温度对显色有影响。温度越高,空白值( ),褪色越快。
【多选题】四氯汞钾吸收液-盐酸副玫瑰苯胺法测定环境空气中 时,关键的实验因素有( )
【单选题】—Is there a museum near here? —Yes, ________. It's on Center Street. [ ]
【单选题】It s the first time that she has been to the museum ,______?
【多选题】四氯汞钾吸收液-盐酸副玫瑰苯胺法测定环境空气中SO2时,关键的实验因素有
【多选题】四氯汞钾吸收液—盐酸副玫瑰苯胺法测定环境空气中的二氧化硫时,关键的实验因素有()。
【多选题】用四氯汞钾吸收液-盐酸副玫瑰苯胺法测定环境空气中SO2时,关键的实验因素有()。